Abnormal Processes

Infectious, inflammatory, and immunologic disorders

• Bacterial infections, (eg, acne, cellulitis, carbuncle, abscess, necrotizing fasciitis, gangrene)
• Viral infections (eg,
  
  herpes infections, chickenpox, rubella, measles, roseola, verrucae)
• Fungal infections, including mycoses, dermatophytosis (eg, tinea)
• Parasitic infections (eg, scabies, lice)
• Immune and autoimmune disorders (eg, discoid lupus erythematosus, scleroderma, dermatomyositis, alopecia, psoriasis, urticaria, allergic dermatosis)

Traumatic and mechanical disorders (eg, thermal injury, decubitus ulcers, effects of ultraviolet light and radiation)

Neoplastic

disorders

• Keratinocytes (eg, seborrheic keratosis, actinic keratosis, basal cell carcinoma, squamous cell carcinoma, and ichthyosis)
• Melanocytes (eg, nevi, melanoma)
• Vascular neoplasms (eg, hemangiomas, Kaposi sarcoma)
• Other (eg, T-cell lymphoma, skin appendage tumors)

Metabolic, regulatory, and structural disorders (eg, vitamin deficiencies, hypervitaminosis, hyperhidrosis)

Vascular disorders (eg, vasculitis, Raynaud disease)

Systemic disorders affecting the skin (eg, Ehlers-Danlos syndrome, Marfan syndrome)

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